How to match date in Millis in Javascript

I am trying to fetch data from a db every 10 mins where the data is inserted with a timestamp. Now using this timestamp i want to visualize another field. The visualization has a step size of 10 mins. So it checks from the start till the stop time to find any match. Here is the code –

[CODE]while((i += step) < stop) {
var key = (new Date(i)).getTime();
var value = key in lookup ? lookup[key].gtse: null;
values.push(value);
}
callback(null, values);[/CODE]

My problem is that the timestamp which is fetched from DB never matches. Here is some data to make it clear.

[CODE]The key values –
1st iteration – 1372168200000
2nd iteration – 1372168800000
The database fetched value – 1372786393088[/CODE]

So in this case the key never matches when it is iterating over lookup. If i dont use step and change the while loop to while((i += 1) < stop) then the browser hangs since there is lot of processing after this.

Should i manipulate the date before db insertion and change the trailing 5-6 places to zero or should i handle this on the client side?

I need some advice how to tackle this.

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